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Mrs Allibon says she "lives in hope" the people responsible will one day be caught.

"They've taken a chunk out of my life," she told reporters outside Glebe Coroner's Court.

"He was just a loving man, and a caring person, and I'm not buttering him up, he was just a normal human being."

On the day of his death - June 7, 2010 - the inquest heard Mr Allibon and his team first spotted the stolen silver Audi doing a dangerous u-turn on the Sydney Harbour Bridge.

The same car later drove up towards their van stationed outside the Darling Park Building.

Three armed men got out of the Audi and surrounded the Chubb employees.

One of the offenders was described as having a "Middle Eastern accent", Ms Barry said.

CCTV footage showed Mr Allibon falling through the doorway of the building face down onto the ground, before the offenders rolled him over and stole his revolver.

Upon hearing this, Mrs Allibon fought back tears, clutching her face in her hands.

When Mr Allibon was shot, Ms Barry found he was moving away from the men.

"He did nothing to provoke the offenders and in fact his service revolver was holstered and he had made no attempt to remove it," she said.

After the inquest findings were handed down, Mrs Allibon said outside court: "I just said to him this morning, looking at his photo, `one day someone is going to come to justice for what they've done to you'."

Mr Allibon had been planning to retire within the year, with the couple, who had been married for 25 years, hoping to spend more time together.